diff --git a/src/Chain.jl b/src/Chain.jl
index 74f43cb..8942bfa 100644
--- a/src/Chain.jl
+++ b/src/Chain.jl
@@ -56,6 +56,10 @@ function insert_first_arg(e::Expr, firstarg; assignment = false)
     elseif head == :call && length(args) > 0
         if length(args) ≥ 2 && Meta.isexpr(args[2], :parameters)
             Expr(head, args[1:2]..., firstarg, args[3:end]...)
+        elseif args[1] == :splat
+            Expr(:call, args[2], Expr(:..., firstarg))
+        elseif Meta.isexpr(args[1], :call) && args[1].args[1] == :splat
+            Expr(:call, args[1].args[2], Expr(:..., firstarg), args[2:end]...)
         else
             Expr(head, args[1], firstarg, args[2:end]...)
         end
@@ -278,8 +282,16 @@ function replace_underscores(expr::Expr, replacement)
     # for all other expressions, their arguments are checked for underscores recursively
     # and replaced if any are found
     else
+        is_splat = false
+        if !isempty(expr.args) && expr.args[1] isa Expr && expr.args[1].args[1] == :splat
+            is_splat = true
+            replacement = Expr(:..., replacement)
+        end
         newargs = map(x -> replace_underscores(x, replacement), expr.args)
         found_underscore = any(first.(newargs))
+        if is_splat && found_underscore
+            newargs[1] = (newargs[1][1], expr.args[1].args[2])
+        end
         newexpr = Expr(expr.head, last.(newargs)...)
     end
     return found_underscore, newexpr